Convert build system to GNU configure & build

This patch adds a standard configure script and converts the Makefile to
automake.  This adresses PR #30, but in a more generic way, and also
eliminates the hard coded CC variable, enabling building with clang or
even a cross compiler.

Note: this is more a proof of concept and does not include the man page
      generation.  Another pull request addresses that.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

.gitignore

@@ -1,2 +1,19 @@
+*~
+*.o
+.deps
 light
 light.1.gz
+aclocal.m4
+autom4te.cache
+compile
+config.h
+config.h.in
+config.log
+config.status
+configure
+depcomp
+install-sh
+missing
+stamp-h1
+Makefile
+Makefile.in

Makefile

@@ -1,36 +0,0 @@
-PREFIX=$(DESTDIR)/usr
-BINDIR=$(PREFIX)/bin
-MANDIR=$(PREFIX)/share/man/man1
-
-CC=gcc
-CFLAGS=-std=c89 -O2 -pedantic -Wall -I"./include" -D_XOPEN_SOURCE=500
-MANFLAGS=-h -h -v -V -N
-
-HELP2MAN_VERSION := $(shell help2man --version 2>/dev/null)
-
-light: src/helpers.c src/light.c src/main.c
-	$(CC) $(CFLAGS) -g -o $@ $^
-
-man: light
-ifndef HELP2MAN_VERSION
-$(error "help2man is not installed")
-endif
-	help2man $(MANFLAGS) ./light | gzip - > light.1.gz
-
-install: light man
-	mkdir -p $(BINDIR)
-	cp -f ./light $(BINDIR)/light
-	chown root $(BINDIR)/light
-	chmod 4755 $(BINDIR)/light
-	mkdir -p $(MANDIR)
-	mv light.1.gz $(MANDIR)
-
-uninstall:
-	rm $(BINDIR)/light
-	rm -rf /etc/light
-	rm $(MANDIR)/light.1.gz
-
-clean:
-	rm -vfr *~ light light.1.gz
-
-.PHONY: man install uninstall clean

Makefile.am

@@ -0,0 +1,19 @@
+SUBDIRS        = src
+doc_DATA       = README.md LICENSE CHANGELOG
+EXTRA_DIST     = README.md LICENSE CHANGELOG
+
+#
+# Target to run when building a release
+#
+release: distcheck
+	@for file in $(DIST_ARCHIVES); do	\
+		md5sum $$file > ../$$file.md5;	\
+	done
+	@mv $(DIST_ARCHIVES) ../
+	@echo
+	@echo "Resulting release files:"
+	@echo "================================================================="
+	@for file in $(DIST_ARCHIVES); do					\
+		printf "$$file    \tDistribution tarball\n";			\
+		printf "$$file.md5\t"; cat ../$$file.md5 | cut -f1 -d' ';	\
+	done

autogen.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+autoreconf -W portability -visfm

configure.ac

@@ -0,0 +1,13 @@
+AC_INIT([light], [1.2-dev], [https://github.com/haikarainen/light/issues])
+AM_INIT_AUTOMAKE([1.11 foreign])
+AM_SILENT_RULES([yes])
+
+AC_CONFIG_SRCDIR([src/light.c])
+AC_CONFIG_HEADER([config.h])
+AC_CONFIG_FILES([Makefile src/Makefile])
+
+AC_PROG_CC
+AC_PROG_INSTALL
+AC_HEADER_STDC
+
+AC_OUTPUT

src/Makefile.am

@@ -0,0 +1,7 @@
+bin_PROGRAMS   = light
+light_SOURCES  = main.c light.c ../include/light.h helpers.c ../include/helpers.h
+light_CPPFLAGS = -I../include -D_XOPEN_SOURCE=500
+light_CFLAGS   = -W -Wall -Wextra -pedantic -std=c89
+
+install-exec-hook:
+	chmod 4755 $(DESTDIR)$(bindir)/light